Storage battery



July 22, 1930. y c. H. EVERETT v 1,770,974v

STORAGE BATTERY Filed. April l2 1926 Patented July I 22, 1930 l .UNITED ySTATES PATENT OFFICE CLAUD H. EVERETT, 0F LNDON, ENGLAND, ASSIGNOR 0F 0NE-HALF TO GEORGE R. CARR, 0F CHICAGO, ILLINOIS STORAGE BATTERY Application :tiled April 12, 1926. Serial No. 101,503.

My invention relates to gas vents for storcup, means supporting the cup above the top age batteries and my object, While allow-ing ot the jar,'the interior ot the cup having comall necessary freedom of escape or venting of munication with the interior of the jar, a plugas in charging and discharging the. battery rality of perforated diaphragms spaced one 5 is to prevent loss or Wastage of the electrolyte above another in the cup, and a filter medium 55 and maintain the top ot the battery jar in a of loose partsupon each of such diaphragms. dry state and thereby prevent grounds or 2. A vent fortmtteryjars comprisingacup, leaks which are caused from a moist condimeans supporting the cup wholly on the jar tion of the top surface ot' the battery jar. My exterior` the interior of the cup being in com- 10 invention therefore consists in the vent con munication with the interior of the jar, ma- 6u sti-acted as described by or included Within terial in the cup'whose partsare in a loose the language of the appended claims. state with passages between them through In the accompanying drawing the figure is which gas from the interior of the jar may a vertical section et enough of a battery cell pass. and means Within the cup separating 1.5 to illustrate my invention. l such material into strata one above another 65 Referring tothe drawing l() designates a and allowing the fiow of gas from a lower jar having a. hard rubber cover lll. this being stratum to an upper stratum.

of usual or any desired construction. Se- In testimony whereof I hereunto aiix my cured to the top, as by means of a hollow signature. 2,) threaded neck l2 screwed into a hole per-fo- CLAUD H. EVERETT, 7e

rating the top, is a cup 13 closed at the top by a cap le which is perforated with a number of small holesl, for the escape to the atmosphere of gas entering the cup from the jar.

T5 Within the cup I piace means in the nature of 75 a filter device which allows the passage of gas but causes the condensation of free moisture accompanying the gas, which moisture being condensed trickles or runs back into ii) the jar from the cup and thus loss ot the elec- 80 trolyte by evaporation ot the Water is disi minished, and at the same time the discharge of aqueous vapor to and its condensation upon the top of the battery jar prevented so C? that a moist condition of its top surface from 85 that cause is avoided. The condensing filter material I prefer to use is glass Wool 16 that is supported within the cup by means of one or more perforated rubber plates or dia- 10 phragms, there being tivo such plates shown 9 in the drawing spaced one above the other and thus I maintain the Wool in vits strata. By thus separating the mass of Wool an ample .quantity may be employed Without danger of 45 matting that would prevent free passage of 95 the gas. I, of course, do not limit myself to i this stratification of the Wool alt-ho I prefer it as an excellent arrangement.

IVhat I claim is: f 50 l. A vent for a battery jar comprising a. `-00 

